Mayor de Blasio’s nonworking staffers are still enjoying themselves at city taxpayers’ expense — and their ranks seem to be growing.

A day after The Post revealed on Tuesday that at least a dozen mayoral staffers awaiting assignment were seen playing cards and watching Netflix at 253 Broadway, a reporter spotted about 20 of them taking it easy at the same florescent-lit city office.

Amid rows of computers, the mostly young staffers included one catching up on Facebook, at least two playing on their smartphones and one man tilting back on his chair as he chatted on a phone.

Staffers were spotted frequently grabbing a restroom key hanging by the door to take breaks.